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Archived:Full duplex with PCM16 codec produces echo on Nokia N95 with AD-54 headset (Known Issue)

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==How to reproduce==
 
==How to reproduce==
The example application [http://www.forum.nokia.com/info/sw.nokia.com/id/8b3a6ed3-e833-4f7c-aee1-4c773196f894/S60_Platform_Full-Duplex_Audio_Example_v2_0_en.zip.html S60 Platform: Full-Duplex Audio Example] supports four codecs: AMR, G.711, G.729, and iLBC.
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The example application [http://www.developer.nokia.com/info/sw.nokia.com/id/8b3a6ed3-e833-4f7c-aee1-4c773196f894/S60_Platform_Full-Duplex_Audio_Example_v2_0_en.zip.html S60 Platform: Full-Duplex Audio Example] supports four codecs: AMR, G.711, G.729, and iLBC.
  
 
With the following modifications, also support for PCM16 format can be added:
 
With the following modifications, also support for PCM16 format can be added:

Revision as of 15:14, 21 June 2011

Template:KBKI


Article Metadata
Tested with
Devices(s): Nokia N95, Nokia N95 8GB
Compatibility
Platform(s): S60 3rd Edition, FP1
S60 3rd Edition FP1
Article
Created: (19 Jun 2008)
Last edited: hamishwillee (21 Jun 2011)

Description

Simultaneous audio playback and recording (full duplex) may result in echo and/or feedback loop when certain wired headsets are attached and audio is being streamed in uncompressed PCM16 format.

How to reproduce

The example application S60 Platform: Full-Duplex Audio Example supports four codecs: AMR, G.711, G.729, and iLBC.

With the following modifications, also support for PCM16 format can be added:

// Specify PCM16 fourCC as follows:
fourCC = TFourCC(' ', 'P', '1', '6');

// Sample rate:
conf.iRate = EMMFSampleRate16000Hz;
// Buffer size:
const TUint KBufferLength = 0x2000;

Running full-duplex audio with this configuration works fine on most devices, but produces echo on the Nokia N95 when used with the AD-54 headset.

Solution

No solution exists.

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